You can send money from your payment wallet to your till number by initiating a B2B request to our API.
Here is our B2B API documentation https://build.at-labs.io/docs/payments%2Fmobile%2Fb2b 

Ensure to specify the following :

"transferType":"BusinessBuyGoods"
"destinationChannel":"your_till_number"
 
Your request body can look like this
{
  "username": "your_username",
  "productName": "your_product_name",
  "provider" : "Mpesa",
  "transferType": "BusinessBuyGoods",
  "currencyCode": "KES",
  "amount": 10,
  "destinationChannel" : "your_till_number",
  "destinationAccount": "you_can_leave_this_empty",
      "metadata": {
        "shopId": "1234",
        "itemId": "abcdef"
              }
 }

If you have any challenges, reach out to us on payment@africastalking.com